CN104320134A - Fast-locking frequency generation circuit - Google Patents
Fast-locking frequency generation circuit Download PDFInfo
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- CN104320134A CN104320134A CN201410581688.7A CN201410581688A CN104320134A CN 104320134 A CN104320134 A CN 104320134A CN 201410581688 A CN201410581688 A CN 201410581688A CN 104320134 A CN104320134 A CN 104320134A
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Abstract
The invention discloses a fast-locking frequency generation circuit, and the circuit comprises a phase-locked loop, a voltage-controlled oscillator, a reference frequency source connected with the phase-locked loop and used to provide reference frequency, a main control chip used to configure the frequency of the phase-locked loop and output control signals, a broadband loop filter circuit connected between the phase-locked loop and the voltage-controlled oscillator, a narrowband loop filter circuit connected between the phase-locked loop and the voltage-controlled oscillator, and a control circuit connected between the broadband loop filter circuit and the narrowband loop filter circuit and used to ensure the same voltage between them. When the fast-locking frequency generation circuit is electrified, the same voltage is ensured between the broadband loop filter circuit and the narrowband loop filter circuit by the control circuit to fast lock the phase-locked loop.
Description
Technical field
The present invention relates to field of radio frequency communication, particularly relate to a kind of frequency generating circuit of quick lock in.
Background technology
Frequency generating units is very important in Modern Communication System and information processing system.It is not only as the local oscillations source of radio-frequency (RF) communication system transreceiver and the clock source of digital signal processor, and the performance index of the direct decision systems of its performance index.At present, wireless with in mobile communication application, along with the raising of data transmission bauds, more and more one of key index becoming design locking time of frequency generating units.Locking time is shorter, then frequency inverted speed is faster, and data transmission bauds is also faster.
Obtain the local frequency of high accuracy, low phase noise, the method of Phase locking frequency synthesis must be adopted, but Phase locking frequency synthesis method is a phase place degeneration factor, there is the intrinsic feedback procedure moved in circles, locking time is longer, and locking time and the requirement of phase noise to loop bandwidth are conflicting: accelerate lock speed, the bandwidth of phase-locked loop is more wide better; Reduce phase noise and burr, then the bandwidth of loop is more narrow better.Modern wireless communication is all very harsh to these two aspects performance requirement.
Fig. 1 is the oscillogram of phase lock loop locks in prior art, introduces the process of Frequency Locking below in conjunction with accompanying drawing 1.
1) T1 stage-acquisition phase: due to the switching of frequency, frequency is from being stabilized to unstable sharply change, and very greatly, phase-locked loop is in out-of-lock condition, needs a large amount of pump electric currents to carry out target acquisition frequency for output frequency and reference frequency phase difference.
2) T2 stage-tracking phase: output frequency and reference frequency phase difference less, phase-locked loop is followed the tracks of output frequency, belongs to the stage of loop self-regulation.
3) T3 stage-stabilization sub stage: output frequency and reference frequency phase difference very little, phase-locked loop is in the state of locking.Such as, in private network communication, when frequency departure be less than ± 100Hz time, phase-locked loop enters stable state.
As shown in Figure 1, in the three phases of locking process, mainly determined the locking time of target frequency by T1 and the T2 stage.And the time of T2 is mainly because the parameter of loop self determines.During T2, phase difference is smaller, and the adjustment by phase-locked loop self can enter T3 very soon.But, the time that T1 acquisition phase consumes, there is direct impact to the integral locking time.
The method improving locking time and reduction phase noise in prior art has following several: (1) is by starting each frequency source in phase-locked loop circuit to sequencing control; Reduce overshoot to the impact of locking time; But its insertion switch is many, sequencing control is complicated, cannot weigh reduction one path filter optimum start-up timing scheme.(2) by the preset voltage-controlled voltage of loop filter to realize quick lock in, according to the preset voltage-controlled voltage of frequency, effectively can reduce pull-in time, accelerate locking, but the raising of phase noise cannot be realized, and hsrdware requirements are more, more electric current can be consumed.(3) loop bandwidth is changed, namely in locking process, loop bandwidth is increased, reduce after locking to be configured to narrow band loop filter circuit by DAC after loop bandwidth is made an uproar with the phase place meeting frequency generating units, in the method, software reads needs the time, and cannot be configured in real time, take a large amount of internal memory, meanwhile, cannot other software operations be carried out in layoutprocedure.
Summary of the invention
The technical problem to be solved in the present invention is, for the defect of prior art, provides a kind of frequency generating circuit of quick lock in.
The technical solution adopted for the present invention to solve the technical problems is: a kind of frequency generating circuit of quick lock in, comprise phase-locked loop circuit, voltage controlled oscillator, the reference frequency source for providing reference frequency be connected with described phase-locked loop circuit, for configuring phase-locked loop frequency and exporting the main control chip of control signal, it is characterized in that: also comprise the broadband loop filter circuit be connected between described phase-locked loop circuit and described voltage controlled oscillator, be connected to the narrow band loop filter circuit between described phase-locked loop circuit and described voltage controlled oscillator, be connected between described broadband loop filter circuit with described narrow band loop filter circuit for realizing voltage follow to ensure described broadband loop filter circuit and the consistent control circuit of described narrow band loop filter circuit voltage,
Described main control chip is connected with described control circuit with described phase-locked loop circuit, described broadband loop filter circuit, described narrow band loop filter circuit respectively; Described main control chip exports control signal to switch broadband loop filter circuit or narrow band loop filter circuit is connected with described phase-locked loop circuit, and makes described broadband loop filter circuit consistent with narrow band loop filter circuit voltage by the described control circuit of control.
In phase lock loop locks process, if carry out quick lock in by broadband loop filter circuit, in locking process, the voltage of the voltage follow broadband loop filter circuit of narrow band loop filter circuit, after the locking of broadband loop filter circuit, the voltage transient of narrow band loop filter circuit reaches stable, control signal is exported by main control chip, narrow band loop filter circuit is switched to be connected between phase-locked loop circuit and voltage controlled oscillator, voltage due to narrow band loop filter circuit is the circuit of broadband loop filter circuit, error is only the error voltage that operational amplifier realizes Following effect, error voltage is minimum, therefore can quick lock in be realized.
Preferably, described control circuit comprises the 3rd switch of following operational amplifier for realizing signal, being connected to described broadband loop filter circuit and the second switch between described operational amplifier and being connected between described narrow band loop filter circuit and described operational amplifier; Described second switch and described 3rd switch are connected with described main control chip and the conducting direction of the control signal control switch exported according to described main control chip, to realize described broadband loop filter circuit and described narrow band loop filter circuit is two-way follows.
Preferably, the conducting direction of the described control signal control switch exported according to described main control chip, comprise with two-way the following of described narrow band loop filter circuit to realize described broadband loop filter circuit: when described broadband loop filter circuit is connected with described phase-locked loop circuit, control the conducting direction of second switch and the 3rd switch, the voltage signal that described broadband loop filter circuit is exported passes through second switch, operational amplifier and the 3rd switch flow to described narrow band loop filter circuit, with the voltage of broadband loop filter circuit described in the voltage follow realizing described narrow band loop filter circuit,
Or when described narrow band loop filter circuit is connected with described phase-locked loop circuit, control the conducting direction of second switch and the 3rd switch, the voltage signal that described narrow band loop filter circuit is exported flows to described broadband loop filter circuit by the 3rd switch, operational amplifier and second switch, with the voltage of narrow band loop filter circuit described in the voltage follow realizing described broadband loop filter circuit.
Preferably, described second switch and described 3rd switch are the combination of single-pole double-throw switch (SPDT), dpdt double-pole double-throw (DPDT) or at least two single-pole single-throw switch (SPST)s.
Preferably, described control circuit comprise be connected with described broadband loop filter circuit for realizing the operational amplifier that signal is followed, the 4th switch being connected to described operational amplifier and described narrow band loop filter circuit; Described 4th switch is connected with described main control chip and the break-make of the control signal control switch exported according to described main control chip; When described broadband loop filter circuit is connected with described phase-locked loop circuit, described 4th switch conduction, the voltage signal that described broadband loop filter circuit exports flows through described operational amplifier and described 4th switch flows to described narrow band loop filter circuit, with the voltage of broadband loop filter circuit described in the voltage follow realizing described narrow band loop filter circuit; And when described narrow band loop filter circuit is connected with described phase-locked loop circuit, described 4th switch disconnects.
Preferably, described 4th switch is single-pole double-throw switch (SPDT), double-point double-throw switch, single-pole single-throw switch (SPST) or unidirectional conducting switch.
Preferably, the feedback circuit for filtering voltage controlled oscillator harmonic wave be connected between described phase-locked loop circuit and described voltage controlled oscillator is also comprised.
Preferably, also comprise for switching the first switch that described broadband loop filter circuit or described narrow band loop filter circuit be connected with described phase-locked loop circuit, for switching the 5th switch that described broadband loop filter circuit or described narrow band loop filter circuit are connected with described voltage controlled oscillator; Described first switch and described 5th switch are connected with described main control chip and the break-make of the control signal control switch exported according to described main control chip.
Preferably, described first switch, described 5th switch are the combination of single-pole double-throw switch (SPDT), dpdt double-pole double-throw (DPDT) or at least two single-pole single-throw switch (SPST)s.
The present invention compared with prior art tool has the following advantages: implement the present invention, by arranging for realizing voltage follow to ensure described broadband loop filter circuit and the consistent control circuit of described narrow band loop filter circuit voltage at described broadband loop filter circuit and described narrow band loop filter circuit, during to ensure to power on, broadband loop filter circuit and narrow band loop filter circuit keep voltage identical, to reach the object of fast lock phase-locked loop, effectively can reduce the phase noise switched in broadband loop filter circuit or narrow band loop filter circuit process simultaneously.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing:
Fig. 1 is the waveform schematic diagram of phase lock loop locks in prior art.
Fig. 2 is the schematic diagram of the frequency generating circuit of quick lock in the embodiment of the present invention 1.
Fig. 3 is the circuit diagram of the frequency generating circuit of quick lock in the embodiment of the present invention 1.
Fig. 4 is the schematic diagram of the frequency generating circuit of quick lock in the embodiment of the present invention 2.
Fig. 5 is the circuit diagram of the frequency generating circuit of quick lock in the embodiment of the present invention 2.
In figure: 11, phase-locked loop circuit; 12, voltage controlled oscillator; 13, broadband loop filter circuit; 14, narrow band loop filter circuit; 15, the first switch; 16, control circuit; 161, operational amplifier; 162, second switch; 163, the 3rd switch; 164, the 4th switch; 17, the 5th switch; 18, feedback circuit; 19, reference frequency source; 20, main control chip.
Embodiment
In order to there be understanding clearly to technical characteristic of the present invention, object and effect, now contrast accompanying drawing and describe the specific embodiment of the present invention in detail.
Embodiment 1
Fig. 2 illustrates the frequency generating circuit of the quick lock in the present embodiment.The frequency generating circuit of this quick lock in, comprise phase-locked loop circuit 11, voltage controlled oscillator 12, be connected with phase-locked loop circuit 11 for providing the reference frequency source 19 of reference frequency, for configuring phase-locked loop frequency and exporting the main control chip 20 of control signal; Also comprise be connected to broadband loop filter circuit 13 between phase-locked loop circuit 11 with described voltage controlled oscillator 12, be connected to narrow band loop filter circuit 14 between phase-locked loop circuit 11 and voltage controlled oscillator 12, be connected between broadband loop filter circuit 13 and narrow band loop filter circuit 14 for realizing voltage follow to ensure the control circuit 16 that broadband loop filter circuit 13 is consistent with narrow band loop filter circuit 14 voltage.Particularly, main control chip 20 is connected with control circuit 16 with phase-locked loop circuit 11, broadband loop filter circuit 13, narrow band loop filter circuit 14 respectively.Main control chip 20 exports control signal switching broadband loop filter circuit 13 or narrow band loop filter circuit 14 is connected with phase-locked loop circuit 11, and make narrow band loop filter circuit 14 consistent with broadband loop filter circuit 13 voltage by controlling control circuit 16, to reach the object of fast lock phase-locked loop, effectively can reduce the phase noise in broadband loop filter circuit 13 and narrow band loop filter circuit 14 handoff procedure simultaneously.
The frequency generating circuit of this quick lock in is in phase lock loop locks process, if main control chip 20 exports control information to be first connected between phase-locked loop circuit 11 and voltage controlled oscillator 12 by broadband loop filter circuit 13 according to system index (i.e. user's request), quick lock in is carried out by broadband loop filter circuit 13, in locking process, by the voltage of the voltage follow broadband loop filter circuit 13 of control circuit 16 corresponding control narrow band loop filter circuit 14, after broadband loop filter circuit 13 locks, the voltage transient of narrow band loop filter circuit 14 reaches stable, according to the control signal that main control chip 20 exports, when switching to narrow band loop filter circuit 14 to be connected between phase-locked loop circuit 11 and voltage controlled oscillator 12, voltage due to narrow band loop filter circuit 14 is the circuit of broadband loop filter circuit 13, error is only the error voltage that operational amplifier 161 realizes Following effect, error voltage is minimum, therefore can quick lock in be realized, vice versa.
Particularly, the frequency generating circuit of this quick lock in also comprises the feedback circuit 18 for filtering voltage controlled oscillator 12 harmonic wave be connected between phase-locked loop circuit 11 and voltage controlled oscillator 12; Understandably, the feedback frequency that voltage controlled oscillator 12 exports inputs to phase-locked loop circuit 11 through feedback circuit 18, and phase-locked loop circuit 11 compares feedback frequency and reference frequency, phase difference output, if when phase difference is less, and lock-in circuit, and effectively can reduce phase difference.
Particularly, the frequency generating circuit of this quick lock in also comprises for switching the first switch 15 that broadband loop filter circuit 13 or narrow band loop filter circuit 14 be connected with phase-locked loop circuit 11, for switching the 5th switch 17 that broadband loop filter circuit 13 or narrow band loop filter circuit 14 are connected with voltage controlled oscillator 12; First switch 15 and the 5th switch 17 are connected with main control chip 20 and the break-make of the control signal control switch exported according to main control chip 20.
As shown in Figure 2, control circuit 16 comprises and following operational amplifier 161 for realizing signal, being connected to the second switch 162 between broadband loop filter circuit 13 with operational amplifier 161 and being connected the 3rd switch 163 between narrow band loop filter circuit 14 and operational amplifier 161.Second switch 162 and the 3rd switch 163 are connected with main control chip 20 and the conducting direction of the control signal control switch exported according to main control chip 20, follow with narrow band loop filter circuit 14 is two-way to realize broadband loop filter circuit 13.
Particularly, when broadband loop filter circuit 13 is connected with phase-locked loop circuit 11, control the conducting direction of second switch 162 and the 3rd switch 163, the voltage signal that broadband loop filter circuit 13 is exported flows to narrow band loop filter circuit 14 by second switch 162, operational amplifier 161 and the 3rd switch 163, to realize the voltage of the voltage follow broadband loop filter circuit 13 of narrow band loop filter circuit 14.Or when narrow band loop filter circuit 14 is connected with phase-locked loop circuit 11, control the conducting direction of second switch 162 and the 3rd switch 163, the voltage signal that narrow band loop filter circuit 14 is exported flows to broadband loop filter circuit 13 by the 3rd switch 163, operational amplifier 161 and second switch 162, to realize the voltage of the voltage follow narrow band loop filter circuit 14 of broadband loop filter circuit 13.
Particularly, the first switch 15, second switch 162, the 3rd switch 163 and the 5th switch 17 can be the combination of single-pole double-throw switch (SPDT), dpdt double-pole double-throw (DPDT) or at least two single-pole single-throw switch (SPST)s, can also go up other switches that other can realize two-way admittance function.The control signal that in the present embodiment, main control chip 20 exports is low and high level signal or other signals for control switch break-make.As shown in Figure 3, in the present embodiment, first switch 15 is switch U6071, second switch 162 is switch U6076, the 3rd switch 163 for switch U6075 and the 5th switch be switch U6073, wherein, U6071, U6076, U6075 and U6073 are single-pole double-throw switch (SPDT), comprise ground pin GND, voltage input pin VCC, signal input tube pin IN, public port pin COM, Chang Kaiguan pin NO, normally closed pin NC.When signal input tube pin IN receives the high level signal of main control chip 20 output, public port pin COM is communicated with normal open pipe pin NO; When signal input tube pin IN receives the low level signal of main control chip 20 output, public port pin COM is communicated with normally closed pin NC.Particularly, the signal input tube pin IN of the first switch U6071, second switch U6076, the 3rd switch U6075 and the 5th switch U6073 is all connected with filter circuit of pressure-stabilizing, and this filter circuit of pressure-stabilizing comprises filter resistance R6070, R6099, R6095 or R6085 of being connected with signal input tube pin IN and one end and is connected to connected node between filter resistance and signal input tube pin IN and electric capacity C6099, C6141, C6140 or C6142 of other end ground connection.The voltage input pin VCC of the first switch U6071, second switch U6076, the 3rd switch U6075 and the 5th switch U6073 is connected with power supply circuits.As shown in Figure 3, the 5V voltage that power supply circuits export inputs to the voltage input pin VCC of the first switch U6071, electric capacity C6138, C6135 of two ground connection in parallel between magnetic bead L6041 and the voltage input pin VCC of the first switch U6071 to diverter switch 5VA_Switch by magnetic bead L6041 again.Understandably, the voltage input pin VCC of second switch U6076, the 3rd switch U6075 and the 5th switch U6073 can receive identical power supply circuits.
As shown in Figure 3, after the signal input tube pin IN of the first switch U6071, second switch U6076, the 3rd switch U6075 and the 5th switch U6073 receives the high level signal of main control chip 20 output, public port pin COM is communicated with normal open pipe pin NO, the pump electric current that phase-locked loop circuit 11 exports flows through broadband loop filter circuit 13 by the first switch U6071 and converts voltage signal to, exports voltage controlled oscillator 12 to by the 5th switch U6073 again, to control the output frequency of voltage controlled oscillator 12; The pump electric current that phase-locked loop circuit 11 exports also inputs to the 5th pin of operational amplifier 161U6072 by second switch U6076 by the voltage signal that broadband loop filter circuit 13 converts to, the Chang Kaiguan pin NO of the 3rd switch U6075 is inputed to again by the 7th pin, narrow band loop filter circuit 14 is inputed to again by public port pin COM, under the use of operational amplifier 161, when ensureing that narrow band loop filter circuit 14 switches with broadband loop filter circuit 13, voltage keeps identical, reaches the object of fast lock phase-locked loop.Understandably, because the loop bandwidth of broadband loop filter circuit 13 is wider, its pump electric current is larger; By the Following effect of operational amplifier 161, the voltage that can realize the voltage of narrow band loop filter circuit 14 and narrow band loop filter circuit 14 is basically identical, after broadband loop filter circuit 13 switches to narrow band loop filter circuit 14, be substantially just in the T2 stage; And the voltage flowing through broadband loop filter circuit 13 is larger, its loop bandwidth is wider, and the time in corresponding T1 stage is shorter, and in its locking process, the time used is shorter, thus reaches the object of quick lock in.
After the signal input tube pin IN received as the first switch U6071, second switch U6076, the 3rd switch U6075 and the 5th switch U6073 receives the low level signal that main control chip 20 exports, public port pin COM is communicated with normally closed pin NC, the pump electric current that phase-locked loop circuit 11 exports flows through narrow band loop filter circuit 14 by the first switch U6071 and converts voltage signal to, exports voltage controlled oscillator 12 to by the 5th switch U6073 again, to control the output frequency of voltage controlled oscillator 12; The pump electric current that phase-locked loop circuit 11 exports also inputs to the 3rd pin of operational amplifier 161U6072 by the 3rd switch U6075 by the voltage signal that narrow band loop filter circuit 14 converts to, the normally closed switch NC of second switch U6076 is inputed to again by the 1st pin, broadband loop filter circuit 13 is inputed to again by public port pin COM, during to ensure that broadband loop filter circuit 13 switches with narrow band loop filter circuit 14, voltage keeps identical, save the time in T1 stage, reach the object of fast lock phase-locked loop.
Particularly, broadband loop filter circuit 13 comprise one end and the first switch U6071 by resistance R6073 be connected other end ground connection electric capacity C6134, be connected to resistance R6069 between resistance R6073 and the connected node of electric capacity C6134 and resistance R6072, one end electric capacity C6100 of other end ground connection, one end to be connected with the resistance C6072 electric capacity C6136 of other end ground connection, one end of the electric capacity C6133 of other end ground connection, one end that to be connected with resistance R6069 that to be connected with resistance R6069 and be connected with resistance C6072 the electric capacity C6137 of other end ground connection.
Narrow band loop filter circuit 14 is comprised one end and the first switch U6071 and to be connected by resistance R6068 the electric capacity C6092 of other end ground connection, resistance C6064 between the connected node being connected to resistance R6068 and electric capacity C6092 and resistance R6067, one end is connected with resistance R6064 the electric capacity C6093 of other end ground connection, one end is connected with resistance R6064 the electric capacity C6094 of other end ground connection, one end is connected with resistance R6067 the electric capacity C6097 of other end ground connection, one end is connected with resistance R6068 the electric capacity C6098 of other end ground connection.Understandably, broadband loop filter circuit 13 is identical with the annexation of the components and parts of narrow band loop filter circuit 14, its difference is that in broadband loop filter circuit 13, the capacitance of electric capacity and the resistance of resistance are much larger than the capacitance of electric capacity in narrow band loop filter circuit 14 and the resistance of resistance, larger to make by the pump electric current of broadband loop filter circuit 13, to distinguish broadband connections and narrow band communication.
In private network communication system, when device power or switching channels frequency, first judge it is broadband connections or narrow band communication, if broadband connections then exports high level signal by main control chip 20, use broadband loop filtering, without the need to switching; If narrow band communication is then by main control chip 20 output low level signal, switching over is carried out after broadband loop filter circuit 13 locks, switch to narrow band loop filter circuit 14, when powering on, the voltage of narrow band loop filter circuit 14 and the voltage of broadband loop filter circuit 13 are consistent substantially, therefore can reach the object of quick lock in.If in narrow band communication process, process is needed to transmit in a large amount of information or image, broadband loop filter circuit 13 can be switched to fast, due to the voltage of broadband loop filter circuit 13 and the voltage of narrow band loop filter circuit 14 basically identical, thus reach the object transmitting fast image and information.
Embodiment 2
As shown in Figure 4, Figure 5, embodiment 2 and the difference of the frequency generating circuit of the quick lock in provided in embodiment 1 are that both control circuits 16 are different.In the present embodiment, control circuit 16 comprise be connected with broadband loop filter circuit 13 for realizing operational amplifier 161 that signal follows, be connected to the 4th switch 164 of operational amplifier 161 and narrow band loop filter circuit 14.4th switch 164 is connected with main control chip 20 and the break-make of the control signal control switch exported according to main control chip 20.Particularly, when broadband loop filter circuit 13 is connected with phase-locked loop circuit 11,4th switch 164 conducting, the voltage signal that broadband loop filter circuit 13 exports flows through operational amplifier 161 and the 4th switch 164 flows to narrow band loop filter circuit 14, to realize the voltage of the voltage follow broadband loop filter circuit 13 of narrow band loop filter circuit 14; And when narrow band loop filter circuit 14 is connected with phase-locked loop circuit 11, the 4th switch 164 disconnects.
Understandably, the 4th switch 164 can be single-pole double-throw switch (SPDT), double-point double-throw switch, single-pole single-throw switch (SPST) or unidirectional conducting switch, can also be other switches.In the present embodiment, the control information that main control chip 20 exports is low and high level signal, and control mode signal is simple.
As shown in Figure 5,4th switch 164 is switch U8009,4th switch U8009 is unidirectional conducting switch, comprise ground pin GND, voltage input pin VCC, signal input tube pin Vin, signal output pin OUT, switching over pin ON/OFF, when switching over pin ON/OFF receives the high level signal of main control chip 20 output, the 4th switch U8009 conducting; Receive the low level signal that main control chip 20 exports, the 4th switch U8009 disconnects.
As shown in Figure 5, when the first switch U6071, the 4th switch U8009, the 5th switch U6073 receive the high level signal of main control chip 20 output, the pump electric current that phase-locked loop circuit 11 exports flows through broadband loop filter circuit 13 by the first switch U6071 and converts voltage signal to, exports voltage controlled oscillator 12 to by the 5th switch U6073 again, to control the output frequency of voltage controlled oscillator 12; The pump electric current that phase-locked loop circuit 11 exports exports the 3rd pin or the 5th pin of operational amplifier 161U6072 to by the voltage signal that broadband loop filter circuit 13 converts to, the signal input tube pin Vin of the 4th switch U8009 is inputed to again by the 1st pin of operational amplifier 161U6072 or the 7th pin, and input to narrow band loop filter circuit 14 by the signal output pin OUT of the 4th switch U8009, to realize the object that broadband loop filter circuit 13 followed by narrow band loop filter circuit 14.When the first switch U6071, the 4th switch U8009, the 5th switch U6073 receive the low level signal of main control chip 20 output, the pump electric current that phase-locked loop circuit 11 exports flows through narrow band loop filter circuit 14 by the first switch U6071 and converts voltage signal to, again by exporting voltage controlled oscillator 12 to, to control the output frequency of voltage controlled oscillator 12, to realize narrow band communication.
The present invention is described by several specific embodiment, it will be appreciated by those skilled in the art that, without departing from the present invention, can also carry out various conversion and be equal to substituting to the present invention.In addition, for particular condition or concrete condition, various amendment can be made to the present invention, and not depart from the scope of the present invention.Therefore, the present invention is not limited to disclosed specific embodiment, and should comprise the whole execution modes fallen within the scope of the claims in the present invention.
Claims (9)
1. the frequency generating circuit of a quick lock in, comprise phase-locked loop circuit (11), voltage controlled oscillator (12), the reference frequency source (19) for providing reference frequency be connected with described phase-locked loop circuit (11), for configuring phase-locked loop frequency and exporting the main control chip (20) of control signal, it is characterized in that: also comprise the broadband loop filter circuit (13) be connected between described phase-locked loop circuit (11) and described voltage controlled oscillator (12), be connected to the narrow band loop filter circuit (14) between described phase-locked loop circuit (11) and described voltage controlled oscillator (12), be connected between described broadband loop filter circuit (13) with described narrow band loop filter circuit (14) for realizing voltage follow to ensure the control circuit (16) that described broadband loop filter circuit (13) and described narrow band loop filter circuit (14) voltage are consistent,
Described main control chip (20) is connected with described control circuit (16) with described phase-locked loop circuit (11), described broadband loop filter circuit (13), described narrow band loop filter circuit (14) respectively; Described main control chip (20) exports control signal to switch broadband loop filter circuit (13) or narrow band loop filter circuit (14) is connected with described phase-locked loop circuit (11), and passes through the described control circuit of control (16) and make described broadband loop filter circuit (13) consistent with narrow band loop filter circuit (14) voltage.
2. the frequency generating circuit of quick lock according to claim 1, is characterized in that: described control circuit (16) comprises the 3rd switch (163) of following operational amplifier (161) for realizing signal, being connected to described broadband loop filter circuit (13) and the second switch (162) between described operational amplifier (161) and being connected between described narrow band loop filter circuit (14) and described operational amplifier (161); Described second switch (162) and described 3rd switch (163) are connected with described main control chip (20) and the conducting direction of the control signal control switch exported according to described main control chip (20), follow with described narrow band loop filter circuit (14) is two-way to realize described broadband loop filter circuit (13).
3. the frequency generating circuit of quick lock according to claim 2, it is characterized in that: the conducting direction of the described control signal control switch exported according to described main control chip (20), comprise with two-way the following of described narrow band loop filter circuit (14) to realize described broadband loop filter circuit (13): when described broadband loop filter circuit (13) is connected with described phase-locked loop circuit (11), control the conducting direction of second switch (162) and the 3rd switch (163), make voltage signal that described broadband loop filter circuit (13) exports by second switch (162), operational amplifier (161) and the 3rd switch (163) flow to described narrow band loop filter circuit (14), with the voltage of broadband loop filter circuit (13) described in the voltage follow realizing described narrow band loop filter circuit (14),
Or when described narrow band loop filter circuit (14) is connected with described phase-locked loop circuit (11), control the conducting direction of second switch (162) and the 3rd switch (163), the voltage signal that described narrow band loop filter circuit (14) is exported flows to described broadband loop filter circuit (13) by the 3rd switch (163), operational amplifier (161) and second switch (162), with the voltage of narrow band loop filter circuit (14) described in the voltage follow realizing described broadband loop filter circuit (13).
4. the frequency generating circuit of the quick lock according to Claims 2 or 3, is characterized in that: described second switch (162) and described 3rd switch (163) are single-pole double-throw switch (SPDT), the combination of dpdt double-pole double-throw (DPDT) or at least two single-pole single-throw switch (SPST)s.
5. the frequency generating circuit of quick lock according to claim 1, is characterized in that: described control circuit (16) comprise be connected with described broadband loop filter circuit (13) for realizing operational amplifier (161) that signal follows, be connected to the 4th switch (164) of described operational amplifier (161) and described narrow band loop filter circuit (14); Described 4th switch (164) is connected with described main control chip (20) and the break-make of the control signal control switch exported according to described main control chip (20); When described broadband loop filter circuit (13) is connected with described phase-locked loop circuit (11), described 4th switch (164) conducting, the voltage signal that described broadband loop filter circuit (13) exports flows through described operational amplifier (161) and described 4th switch (164) and flows to described narrow band loop filter circuit (14), with the voltage of broadband loop filter circuit (13) described in the voltage follow realizing described narrow band loop filter circuit (14); And when described narrow band loop filter circuit (14) is connected with described phase-locked loop circuit (11), described 4th switch (164) disconnects.
6. the frequency generating circuit of quick lock according to claim 5, is characterized in that: described 4th switch (164) is single-pole double-throw switch (SPDT), dpdt double-pole double-throw (DPDT), single-pole single-throw switch (SPST) or unidirectional conducting switch.
7. the frequency generating circuit of the quick lock according to any one of claim 1 ~ 6, is characterized in that: also comprise the feedback circuit (18) for filtering voltage controlled oscillator (12) harmonic wave be connected between described phase-locked loop circuit (11) and described voltage controlled oscillator (12).
8. the frequency generating circuit of quick lock according to claim 7, is characterized in that: also comprise for switching the first switch (15) that described broadband loop filter circuit (13) or described narrow band loop filter circuit (14) be connected with described phase-locked loop circuit (11), for switching the 5th switch (17) that described broadband loop filter circuit (13) or described narrow band loop filter circuit (14) are connected with described voltage controlled oscillator (12); Described first switch (15) and described 5th switch (17) are connected with described main control chip (20) and the break-make of the control signal control switch exported according to described main control chip (20).
9. the frequency generating circuit of quick lock according to claim 8, is characterized in that: described first switch (15), described 5th switch (17) are single-pole double-throw switch (SPDT), the combination of dpdt double-pole double-throw (DPDT) or at least two single-pole single-throw switch (SPST)s.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410581688.7A CN104320134B (en) | 2014-10-27 | 2014-10-27 | The frequency generating circuit of quick lock in |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410581688.7A CN104320134B (en) | 2014-10-27 | 2014-10-27 | The frequency generating circuit of quick lock in |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106199184A (en) * | 2015-05-07 | 2016-12-07 | 苏州普源精电科技有限公司 | A kind of spectrum analyzer with quick phase-locked function |
| US10103719B2 (en) | 2013-07-22 | 2018-10-16 | Nvidia Corporation | Integrated voltage regulator with in-built process, temperature and aging compensation |
| CN111837339A (en) * | 2018-08-28 | 2020-10-27 | 华为技术有限公司 | Phase-locked loop circuit and apparatus using the same |
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| JP2001011829A (en) * | 1999-06-26 | 2001-01-16 | Sugiaki Kusatake | Buffer type guard fence, method for constructing the same, and cushioning material for the same |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US10103719B2 (en) | 2013-07-22 | 2018-10-16 | Nvidia Corporation | Integrated voltage regulator with in-built process, temperature and aging compensation |
| TWI639080B (en) | 2013-07-22 | 2018-10-21 | 輝達公司 | Method and apparatus for regulaing voltage for a processor |
| US10200022B2 (en) | 2013-07-22 | 2019-02-05 | Nvidia Corporation | Integrated voltage regulator with in-built process, temperature and aging compensation |
| CN106199184A (en) * | 2015-05-07 | 2016-12-07 | 苏州普源精电科技有限公司 | A kind of spectrum analyzer with quick phase-locked function |
| CN106199184B (en) * | 2015-05-07 | 2019-12-31 | 苏州普源精电科技有限公司 | Spectrum analyzer with quick phase locking function |
| CN111837339A (en) * | 2018-08-28 | 2020-10-27 | 华为技术有限公司 | Phase-locked loop circuit and apparatus using the same |
| CN111837339B (en) * | 2018-08-28 | 2022-06-28 | 华为技术有限公司 | Phase-locked loop circuit and device using the same |
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| CN104320134B (en) | 2017-10-03 |
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